Simple answer, no I don't understand itDo you understand the theory behind an emitter follower circuit?
To understand how this circuit work first you must understand the limitations of a simply Zener regulator
OK then. It looks like we need to back up even further. Do you understand basic transistor theory? Mainly, the effect of base voltage vs emitter voltage and the effect on transistor current? Since this is the HOMEWORK section, we will try to guide as much as we can but really need to know what level of knowledge you have in order to build on it. How long have you been studying electronics? Tell us about your understanding of transistor operation and we can go from there.
The attachment may be of interest.
I don't now it is only me, but the t_n_k explanation is not a key to understand how this voltage regulator work.Thanks t_n_k, your explanation gives me an in-deep understand of how this work, I amgreater than 100 aware of the saturation and un-saturation of an transistor, but never pay too much attention to it, as I mainly used it as a switch before.
I will be looking into this from now on.
I don't now it is only me, but the t_n_k explanation is not a key to understand how this voltage regulator work.
As a matter of fact the "effect" describable by t_n_K (Vbe varies with Ie) is a disadvantage. This "effect" reduces the stiffness our voltage regulator.
The voltage regulation would be "tighter" if Vbe was independent of the load current.
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